I found that Phidgets was not marked as "identified developer" on my Macbook. By accident, when installing another app, I found those check-boxes in "Security & privacy" preferences. Since I checked the check-box for Phidgets, it is working!
It looks like in the newer versions of MacOS, you need to give explicit permission to drivers after installing in order for them to function. You can read more about it here.
...and the objects are no longer working.
this is now happening under high sierra and el capitain
both with phidgets 21 & 22 installed.
i tried deleting and replacing the interfacekit objects but no luck.
any suggestions?